Comment by skissane

> You'll also note that League of Nations (and UN) mandates can not change the laws of the lands they administer - then can only issue temporary orders (usually limited to three years). So British orders are not valid in the holy land today

I don't know where you are getting this from, it isn't true. The League of Nations Palestine Mandate [0] granted the UK "full powers of legislation and of administration, save as they may be limited by the terms of this mandate" (Article 1). You will not find any limitation preventing them from making permanent laws within it.

The UK imposed its own legal system on the Mandate, as Article 1 allowed. It ended up mostly abolishing Ottoman law, although it retained it in certain areas (especially family law, inheritance, religious affairs and real estate). The laws it imposed were not necessarily those of the metropolitan UK – the criminal code was largely copied from colonial India. The starting point of Israeli law is Israel's decision at the time of independence to continue the British Mandate's legal system, until such time as the Knesset decided to alter things. It wasn't until 1977, for example, that Israel completely replaced the British-imposed penal code with its own. Palestinian law has the same fundamental starting point, although with the added complexity of being overlaid with Egyptian and Jordanian legislation (in Gaza and the West Bank, respectively), and then a mixture of Israeli and Palestinian legislation laid on top of that.

[0] https://en.wikisource.org/wiki/Palestine_Mandate_(1922)